Vibrating hand trowel



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VIBRATING HAND- TROWEL Filed July 15, 1944 w%. u. Y. is mmmww Rona M MMM UNUE/J mum ,WJWWWW w w. P. DAY VET-AL Patented May 14, 1946 William P. Day,"John J. Day, and William r.

Day, (In, Cleveland Heights, and Heglaw, East Cleveland, Ohio Vincent E.

Application July 13, 1944. serial n siacss .2 Claims.

This invention relates to a hand-operated trowel for use in spreading, compressing and vibrating a layer of mortar concrete mix or the like.

One of the objects of the invention is to provide a trowel of the character described which is provided with power-operatedmeans for imparting rapid and violent vibrations to the trowel .in V

a plane substantially parallel with the working face of the trowel.

Another object of the invention is to provide a trowel having the above described distinguishing features and characteristics which is .provided with a motor-operated vibrator unit which is carried by the trowel, :the motor being shielded so as to reduce to a minimum the transmission of vibrations from the vibrator unit to the motor.

A furtherobject of the invention is to provide a, hand-operated trowel of the character described which is adapted for use in spreading, compressing and vibrating a layer of mortar or concrete mix, the vibrator unit being operated by an electric motor which is connected directly with the rotor of the vibrator, the motor being shielded against the vibrations of the vibrator unit.

A still further object of the invention is to provide a hand-operated trowel of the character described which is provided with a plurality of handles for operating the same which are formed of rubber or similar material so as to prevent the vibrations being transmitted to the operator.

Further and more limited objects of the invention will appear as the description proceeds and by reference to the accompanying drawings in which Fig. 1 is a view in front elevation of our improved trowel;

Fig. 2 is a vertical sectional view taken on the line 2--2 of Fig. 6;

Fig. 3 is a horizontal sectional view taken on the line 33 of Fig. 2;

Fig.4 is a vertical sectional view ofthe rotor taken on the line 4-4,of Fig. 5;

Fig. 5 is a horizontal sectional view taken on the line 5-5 of Fig. 4;

Fig. 6 is an end view in elevation of the trowel; Fig. 7 is a transverse sectional view of an attachment for the trowel taken on the line 1-1 of Fig. 8; V

Fig. 8 is a top plan view of the attachment; Fig. 9 is a top plan view of the trowel; and Fig. 10 is a view in end elevation of the trowel with a tool secured thereto.

Referring now to the drawings, the reference character I designates a casting which is preferably formed of a1uminum,magnesium or some similar light material. The body of the casting has therein a centrally disposed recess in which is journaled a shaft 2 to which is keyed a rotor 3 which has a counter-weighted portion 3 The lower end of the shaft 2 is journaled in a bearing 5 carried by the body member while the upper end of the shaft is journaled in a bearing 4 car-.

ried by a-closure plate 6 which is circular in shape and-secured in place by bolts 1. The shaft 2 projects through an opening provided in the plate 6 which opening is closed by a plate 8 held in place by bolts 9. The plate 6 has thereon a pair of integrally formedsemi-circular ribs or flanges l0. 7 Secured to each-of the .semi circular flanges l0 area pair of semi-circular members H which.

are preferably formed of rubber or similarcomposition. The members H are secured in place by means of curved plates l2'which are held in place by bolts [3. Carried by the casting is an electric motor M having a shaft I4 which is directly connected to the'shaft 2 of the rotor by means of a rubber sleeve IS. The motor M is secured to the members H by means of a sleeve l6 which is secured by bolts l3 and segment nuts Ili The rotor 3 is shown in detail in Figs. 4 and 5 and preferably consists of a casting which is pro vided'with a counter-weighted portion 3 posed on opposite sides of the rotor are a pair of plates I! which are preferably brazed or welded thereto and shaped as shown most clearly in Fig. 4. Secured to the trowel and disposed at opposite sides thereof are a pair of angular plates l8 which are held in place by bolts l9. Secured to each of the plates [8 is a handle 20 which is provided with an opening 2| by means of which the trowel is manipulated. The handles are secured in place by a plurality of bolts 22. The front of the trowel is provided with an angularly disposed rib 23 which extends upwardly therefrom,- as shown most clearly in Fig. 6. Also formed integrally with the casting are a plurality of spaced ribs 24. The working face of the trowel is flat and is disposed in the same plane as the bottom edge of the ribs 24.

It will be notedthat the motor is vertically disposed and connected directly with the shaft of the rotor. The motor is adapted to be connected with a suitable source of current by means of a wire 25 and is driven at high speed of the order of 5000 to 7500 revolutions per minute. It will be noted that the rotor is journaled 'so as to rotate in ayplane substantially parallel with the working face of the trowel so as to impart rapid Dis- 7 and violent vibrations thereto as the trowel is moved over the surface of the layer of mortar or mix. The trowel is adapted and intended for use in spreading and vibrating a layer of mortar or concrete mix. The trowel may be used for spreading and vibrating a layer of mix in a roadbed or sidewalk or in a wall or floor.

In Figs. 7, 8 and 10 there is disclosed an attachment for the vibrator which comprises a rod 26 which i welded to a curved plate 21 which has therein openings 29 and 30. The rod 26 may be made up of a plurality of sections, if desired, and is used to transmit vibrations to a column or form. The attachment is secured to the trowel by means of bolts 3|.

It will now be clear that we have provided a vibrating trowel which will accomplishthe objects of the invention as hereinbefore stated. Various changes may be made in the details of construction and arrangement of part without having a bottom wall for smoothing cement and the like, said casting having a recess therein; a rotor,said rotor including an axle and being unbalanced about its axle, said rotor being disposed in said recess with the axle thereof extending normal to said bottom wall; a bearing in said departing from the spirit of our invention. The

embodiment'of the invention herein disclosed is to be considered merely as illustrative and not in a limiting sense as the invention is limited only in accordance with the scope of the appended claims.

Having thus described our invention, what we claim is:

1. A hand operated trowel comprising a casting having a bottom wall for smoothing cement and the like, said casting having a recess therein; a rotor, said rotor including an axle and being unbalanced about its axle, said rotor being disposed in said recess with the axle thereof extending normal to said bottom wall; a bearing in said casting for one end of said axle; a plate closing said recess, said plate having an opening therethrough; a bearing in said opening for said rotor casting for one end of said axle; a plate closing said recess, said plate having an opening therethrough; a bearing in said opening for said rotor axle, said plate including flanges extending parallel with said axle and arcuately; a motor for driving said axle, said motor including a casing having depending arcuate flanges; an arcuate resilient member attached to each of the first-mentioned flanges and to the respective depending flanges for supporting said motor, said motor including a drive shaft in alignment with said axle; a resilient sleeve interconnecting the drive shaft and said axle; and handles for said trowel comprising a pair of spaced resilient members attached at one end to said casting and projecting in a direction laterally with respect to the plane of rotation of said rotor.

WILLIAM P. DAY. JOHN J. DAY. WILLIAM P. DAY, J R. VINCENT E. I-IEGLAW. 

